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maintains expr in an unevaluated form.
  • Hold has attribute HoldAll, and performs no operation on its arguments.
  • Hold[e1, e2, ...] maintains a sequence of unevaluated expressions to which a function can be applied using Apply.
  • Even though expr itself is not evaluated, Hold[expr] may still evaluate if expr is of the form f[args], and upvalues for f have been defined.  »
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